diff --git a/youtube_dl/downloader/common.py b/youtube_dl/downloader/common.py
index 46b5e6841..7f2cda086 100644
--- a/youtube_dl/downloader/common.py
+++ b/youtube_dl/downloader/common.py
@@ -341,7 +341,7 @@ class FileDownloader(object):
 
         return self.real_download(filename, info_dict, md5)
 
-    def real_download(self, filename, info_dict, *args):
+    def real_download(self, filename, info_dict):
         """Real download process. Redefine in subclasses."""
         raise NotImplementedError('This method must be implemented by subclasses')
 
diff --git a/youtube_dl/downloader/dash.py b/youtube_dl/downloader/dash.py
index 8b6fa2753..61f6b1f16 100644
--- a/youtube_dl/downloader/dash.py
+++ b/youtube_dl/downloader/dash.py
@@ -1,4 +1,5 @@
 from __future__ import unicode_literals
+import hashlib
 
 import re
 
@@ -10,7 +11,7 @@ class DashSegmentsFD(FileDownloader):
     """
     Download segments in a DASH manifest
     """
-    def real_download(self, filename, info_dict):
+    def real_download(self, filename, info_dict, md5=False):
         self.report_destination(filename)
         tmpfilename = self.temp_name(filename)
         base_url = info_dict['url']
@@ -19,18 +20,20 @@ class DashSegmentsFD(FileDownloader):
         is_test = self.params.get('test', False)
         remaining_bytes = self._TEST_FILE_SIZE if is_test else None
         byte_counter = 0
-
+        if md5:
+            m = hashlib.md5()
+        else:
+            m = None
         def append_url_to_file(outf, target_url, target_name, remaining_bytes=None):
             self.to_screen('[DashSegments] %s: Downloading %s' % (info_dict['id'], target_name))
             req = compat_urllib_request.Request(target_url)
             if remaining_bytes is not None:
                 req.add_header('Range', 'bytes=0-%d' % (remaining_bytes - 1))
-
             data = self.ydl.urlopen(req).read()
-
             if remaining_bytes is not None:
                 data = data[:remaining_bytes]
-
+            if m is not None:
+                m.update(data)
             outf.write(data)
             return len(data)
 
@@ -53,7 +56,8 @@ class DashSegmentsFD(FileDownloader):
                     remaining_bytes -= segment_len
                     if remaining_bytes <= 0:
                         break
-
+        if m is not None:
+            open(filename, 'w').write(m.hexdigest())
         self.try_rename(tmpfilename, filename)
 
         self._hook_progress({